[FB-Tracker] Created: (CORE-5576) Bugcheck on queries containing WITH LOCK clause

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[FB-Tracker] Created: (CORE-5576) Bugcheck on queries containing WITH LOCK clause

JIRA tracker@firebirdsql.org
Bugcheck on queries containing WITH LOCK clause
-----------------------------------------------

                 Key: CORE-5576
                 URL: http://tracker.firebirdsql.org/browse/CORE-5576
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 3.0.2, 4.0 Initial, 4.0 Alpha 1, 3.0.3, 4.0 Beta 1
         Environment: all engines
            Reporter: Roman Simakov


Reproducible example:

Create a database (say /tmp/wl.fdb) by script
create database '/tmp/wl.fdb';

create table t (
i integer not null primary key,
d char(1024) computed by ('qwert'),
s varchar(8192)
);

insert into t values (1, 'format1opqwertyuiopqwertyuiop');
commit;

Then perform backup/restore operation:
./gbak -b /tmp/wl.fdb stdout | ./gbak -c -rep stdin /tmp/wlr.fdb

Now if you run
select * from t where i=1 with lock;
it results in writing broken record version and the next run
select * from t where i=1;
will lead to bugcheck.

Explanation:
VIO_writelock always sure that it writes delta but in case of example after restore calculated fields there are two formats. VIO_writelock writes a full version of format 1 but not a delta but the functions always set delta flag. To fix it's enough to copy correct behaviour from VIO_modify.

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